Transcript Sulfur 35 - Texas State University

Sulfur 35
Characteristics
Radioactive half-life: 87.4 days
Decay mechanism: Beta emission
Energy: Emax = 167 keV
Eavg = 49 keV
Contamination monitoring: Thin window GeigerMueller detector, liquid scintillation counter for
wipe surveys
Dosimetry: Urinalysis
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Decay Table
Days
0
1
2
3
4
5
6
7
1000
992
984
976
969
961
954
14
946
939
931
924
916
909
902
21
895
888
881
874
867
860
863
28
847
840
833
827
820
814
807
35
801
795
788
782
776
770
764
42
717
711
705
700
694
689
683
49
678
373
667
662
657
652
646
56
941
636
631
626
621
616
612
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Volatility
Radiolysis of S-35 labelled amino acids may
lead to the release of S-35 labelled volatile
impurities. Delivery vials should therefore be
opened in a fume hood
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Stabilizers
The addition of stabilizers (buffers) will reduce,
but not eliminate, the evolution of S-35 volatiles
from tissue culture media. Incubators should be
checked for contamination after using S-35
methionine or other volatile compounds.
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Differentiation Difficulty
S-35 may be difficult to distinguish from C-14. If
both nuclides are being used in the same
laboratory, establish controls to ensure they are
kept separate. If "unknown" contamination is
found, treat it as C-14.
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